Control system for sequential operation of pump motors



7 Sheets-Sheet l J. J. DELANEY ET AL ATTORNEY W w .H W JT N fl 0 R 3M4CONTROL SYSTEM FOR SEQUENTIAL OPERATION OF PUMP MOTORS Filed Feb. 16,1953 May 21, 1957 y 1957 J. J. DELANEY ETAL 2,793,337

CONTROL SYSTEM FOR SEQUENTIAL OPERATION OF PUMP MOTORS Filed Feb. 16,1953 7 Sheets-Sheet 2 JoHN J. DELANEY ALBERT F RoMANowsm INVENTOR.

ATTORNEY y 1957 J. J. DELANEY ETAL 2,793,337

CONTROL SYSTEM FOR SEQUENTIAL OPERATION OF PUMP MOTORS Filed Feb. 1a.1953 7 She ets-Sheet 3 has JOHN J. DELHNEY ALBERT F. Romnnowsm INVENTOR.

RTTORNEY y 1957 J. J. DELANEY ET AL CONTROL SYSTEM FOR SEQUENTIALOPERATION OF PUMP MOTORS Filed Feb. 16, 1953 7 Sheets-Sheet 5 m m mm mmRom uRm DE m NE mm JR y 1957 J. J. DELANEY ETAL CONTROL SYSTEM FORSEQUENTIAL OPERATION OF PUMP MOTORS Filed Feb. 16, 1953 '7 Sheets-Sheet6 mom m m/ V Nm m0] ER DE .NE H5 km M HTTORNEY y 1957 J. J. DELANEY EIAL2,793,337

CONTROL sys'mu FOR SEQUENTIAL OPERATION OF PUMP MOTORS Filed Feb. 161953 7 Sheets-Sheet '7 JOHN J. DELHNEY HLBERT F. Ronawowsm INVENTOR.

BMW

United States Patent '0 CONTROL SYSTEM FOR SEQUENTIAL OPERATION OF PUMPMOTORS John J. Delaney-and Albert ERomanowski, Fort Wayne,

Ind., *assignors toBowser, Inc.,"Fort Wayne, IniL, a corporation ofIndiana Application February 16, 1953, Serial No. 337,013

18 Claims. (Cl. 318-102) service stations, there may be anywhere fromfour to six or more dispensing pedestals connected to receive liquidfrom a tank. Tosupply the proper amount of liquid to the pedestals whichare operating may require one or two pumps since while one to say fivepedestals of eightmay be in operation at one time. At no time in theoperation of such a station would it be likely that. all of thepedestals would be in operation. The number of operators would, initself be a limiting factor as would the fact that not all customerswould demand the same grade of fuel and the different grades, of courserequire a separate pumping system.

The fact that the pedestals do not include the usual pump and motor andtheir appurtenances reduces the. cost of'the pedestals whereas thepumping mechanism itself has only two pumps and motors. Thus in a systemusing eight or even more pedestals, there is a. saving of six or morepumps and six or more motors. These units are expensive and the savingis considerable.

Present day gasolines are being made with higher vapor pressures.so'that the imposition of a high lift or resistance to flow on thesuction side of the pumps results in pulling the gasoline apart and thepumping systems become vapor locked. Flow of liquid ceases and thesystem is inoperative.

A further advantage of this system is that the pumps can be installedclosely adjacent the tanks so that the resistance'to flow on the suctionside can be reduced to a minimum and the liquid can be delivered throughthe long runs of pipe leading to the various pedestals under pressure.

Another advantageof the system is that the suction lines are not runhorizontally for long distances near the surface of the ground ordriveways so that they and the liquid inthem can absorb heat from thesun as in the case where each'dispenser has its own pump and motor.

These and other objects will become apparent from a study of thisspecification and the drawings which are attached hereto, form a parthereof and in which:

Figure 1 is an elevation of the pumping apparatus.

Figure 2 is a plan view of the pumping apparatus.

Figure 3 is anelevation of the pumping control apparatus.

Figure 4 is a schematic view of the hydraulic and electrical portions ofthe entire system.

Figure 5 is an end view of the control apparatus.

Figure 6 is a detail view or" the primary switch.

Figure 7 is an elevation, partly in section, of the back pressure valve.

Figure 8.,is an elevation of a modified form of control apparatus.

Figure 9 is an elevation, partly in section, of the apparatus ofFigure.8. I

Figure 10,is a sectional view taken substantially on line 1010 of Figure8 showing the actuating mechamsm.

Figure 11 is asectionalview of the air separator vent takensubstantially on line 1111 of Figure 2.

Pumping system Referring first to Figure 4, the system comprises thetank 1, which has a foot valve 3, a suction line 5 which is manifoldedby branches 7, 9 to the pumps 11, 13. The discharge pipes 15, 17 fromthe pumps pass through the gas separators 19, 21 and back pressurevalves 23 25 to acommon discharge line 27. Line 20 carries the gas andliquid discharged from the gas separators to the tank.

Pedestals 29, 31, 33, 35, 37, 39, 41, 43 and 45 are all connected toreceive liquid from the line 27.

Each pedestal is provided with the usual meter, hose,

.nozzle, sight glass, register, interlock, hose hook and other partswhich are commonly employed in such apparatuses. Each hose hook isconnected to a switch and serves to close it when the hose nozzle hasbeen removed from the hose hook and the switch lever has beenmanipulated to its on position.

All ofthis structure is old in the art and pedestals of the kinddescribed have beenrnarketed by the gasoline pump industry for a numberof years.

The switches referred to as being closed and opened by the switch leversare here numbered 47, 49, 51, 53, 55, 57, 59, 61 and 63.

The power supply mains are indicated by numerals 65, 67. Main 65 is theneutral wire and is connected to one contact .ofall of the aforesaidswitches 47 to 61. The second contacts of said switches are individuallyconnected by suitable wires 47, 49', 51', 53', 55', 57, 59 and 61' tothe windings of solenoids 69, 7'1, 73, 75, '77, 79, 81 and .83 while theopposite sides of the windings are connected to the other main 67.

The main 67 is also connected to one side of each of the primary switch85 and the secondary switch 87 Both of said switches are preferably ofthe mercury type.

The other. side of switch 85 is connected by line 89 to one. input pole91 of a reversing switch 93 while the switch87 isconnected by line 95 tothe other input pole 97 of the same switch.

The main 65 is connected directly to the motors 99, 101 which drive thepumps 11 and 13 respectively.

Output pole 1030f the reversing switch is connected by line 105 to theother side of motor 99 while output pole 107 of the reversing switch isconnected by line 109. to the motor 101.

Thus, with the reversing switch in one position, primary switch 85 willstart motor 99 and secondary switch 87 will start motor 101 while if theswitch 93 is reversed the primary switch will start motor 101 while thesecondary switch will start motor 99.

The purpose of this structure is to distribute the wear between the twomotors and pumps. This is necessary because the primary switch isenergized each time any pedestal is operated'while the secondary switchwill be energized only after a predetermined number of pedestals areoperated jointly. Since the primary switch will be actuated more oftenthan the secondary by reason of this fact, it follows that if the pumpswere not alternately hooked to number one switch, say every other week;

In some cases it may be desired 45 which is designed with larger pipe,hose, etc. so that a larger fiow rate is attained through the unit thanthrough aregular pedestal. In case such a unit is operated from the samepump with a regular pedestal, the

latter might be starved.

To avoid this situation, the switch 63 of the pedestal 45 may beconnected in parallel with the secondary I switch 87 by lines 179, 181so thatone or theother of the motors 99, 101 may be started at once,depending upon the setting of the reversing switch 93. Thereafter,

1 should any pedestal switch 47 to 61 be closed, the other pump willalso be energized so that both pumps will be used to supply the twopedestals.

Referring to Figure 7, the internal structure of the i back pressurevalves 23, 25 will be'seen to comprise merely a poppet 115 which isurged by a spring 117 2 toward its seat 119. The valve is opened by theflow to restrict the amount of liquid flowing back to the tank whilepermitting the free escape of any gases.

The control panel The power means preferably in the form of solenoids 69to 83 effect the operation of the primary and secondary switches 85 and87 by means of the mechanism shown in Figures 3, and 6.

The solenoids 69 to 83 are all mounted in a row on the panel 127 whichis preferably mounted in a cabinet 129.

Each solenoid has an, armature 131 which carries a roller harness 133 inwhich is mounted a roller 135. A suitable terminal board 30 is providedfor connecting the solenoids with the pedestal switches and a similarboard 40 is provided for connecting the switches 85 and 87 with the mainand the reversing switch 93.

The rollers 135 are disposed below and preferably in substantiallytangential contact with the lower side of a thin, fiat tape 137. Aseries of fulcrums or rollers 139 are rotatably fixed to the panel 127,above and preferably in tangential contact with the upper surface of thetape. The latter rollers are also preferably equidistantly spaced fromeach other and from rollers 135.

The tape 137 is fixed at one end to a headed anchor 141 which issupported in an ear 143 formed on the panel. The other end of the tapeis fixed to a plunger rod 145 which is guided in a yoke 147. The rodcarries a collar 149 and a spring 151 confined between the collar andone end of the yoke which serves to urge the rod in a direction totension the tape.

The lower portion of the rod is threaded as at 153 and adjustablycarries a cam nut 155 and a lock nut 157. Pivotally mounted at 159 onthe panel and adjacent the cam nut is a lever 161 which has arms 163arranged to hold a mercury type switch 87 which is the secondary controlswitch. The lever has a projection 165 which bears on the nut 155 and isheld in contact therewith by a spring 167.

For operating the primary switch 85 there is provided a bail 169 whichis pivotally mounted at 171 on cars 173 bent from the panel. A hook 175forms a part of the harness 133 of each solenoid and is engaged beneaththe bail. i

A switch holder 177 is connected to one end of the bail and the primary,mercury type switch 85 is mounted thereon so as to be tiltedendwise asthe bail pivots. The weight of the bail normally holds the switchin itsoff or open condition, but as soon as any one of the solenoids toutilize a pedestal harness thereof will raise the bail and hold itraised to hold switch 85 in its on or closed condition.

The nut 155 previously dlescribed is set so that it normally holds theswitch 87 in the ofi or open condition. As the plunger 145 is drawn downby the operation of a solenoid, due to the shortening of the tape, theswitch will move toward its on or closed condition. However, the firstactuated solenoid does not provide suflicient movement to effectclosing. Similarly, depending upon the setting of nut 155, the secondactuated solenoid also does not close the switch. Preferably, the switch87 is closed only if three of the solenoids are held energized. Ifdesired, the nut 155 may be set so that four or more solenoids wouldhave to be held energized to close the switch 87, all in accordance withthe requirements of the system and the capacity of the pumps employed.

The pedestal 45 has its switch 63 connected by wires 179 and 181 to theneutral 65 and to the line 95 so that it is directly paralleled with thesecondary switch 87. Thus, whichever motor 99 or 101 is connected byreversing switch 93 for control by secondary switch 87 will be energizedupon closure of switch 63 in the high-speed pedestal.

- Operation The operation of any one of the switches 47 to 61 willenergize the corresponding solenoid 69 to 83. Assume that pedestal is tobe used to fill a vehicle tank. Switch 53 will close the circuit fromthe neutral main 65, through switch 53, line 53', solenoid 75 to main67.

The solenoid is energized and its roller 135 is drawn up with theharness 133 to place a bight in the tape 137 to shorten its effectivelength and draw the plunger 145 and nut 155 downwardly. This actionpermits the secondary switch 87 to be tilted slightly, but not enough toclose.

The raising of the harness 133 also raises hook 175 and bail 169. Thisaction tilts the primary switch far enough to close it. If we assumethat the selector switch is set so that pump 11 and motor 99 are tostart first, it will be seen that switch 35 closes a circuit from thehot main 67 through switch 85, terminals 91, 103, line 105, motor 99 tothe neutral main 65 so that the motor 99 and pump 11 are started andheld in operation.

Suppose that the nut 155 is set so that it will cause switch 87 to closewhen the third pedestal is operated. When a second pedestal, say 29, isoperated and its switch 47 is closed, the solenoid 69 will be energizedand its roller will place a second bight in the tape 137 shortening itseffective length and pull plunger down farther, but not far enough toclose switch 87.

Since the bail 169 is already raised and switch 85 is closed, theenergization of the solenoid has no effect on this structure.

Whenthe third pedestal, say 41, is operated with the preceding two heldoperated, its solenoid81 will be energized. The solenoid cannot afiectswitch 85 for the reasons described above but when its roller places afurther bight in the tape 137, the plunger 145 and nut are drawn downfar enough so that spring 167 will, in tilting the switch 87 to followthe nut 155, close the switch.

It will be seen from Figure 4 that switch 87 closes the remainingcircuit from hot main 67 through switch 87, terminals 97, 107 of thereversing switch, line 189, motor 101 to neutral main 65. Pump 13 willtherefore be started and will be held in operation so long as all threepedestals are being used, but as soon as any one of the pedestalswitches is opened and no additional pedestal switches are closed, thelast started pump 13 and motor 101 will be stopped. It is obvious thatregardless of which of the pedestals 29 to 43 is started, the pump 11will be started and that regardless of which pedestal is the third oneto be placed in service, it will start the second pump 13.

The reversing switch merely changes the above described circuits so thatwhen primary switch 85 is closed it will close the circuit 67, S5, 91,107, 109, 101 to 65 to start the pump 13 while the secondary switchcloses the circuit 67, 87, 95, 97, 3, 105, 99 to 65 to start the pump11.

The switch 63 of the high-speed or truck servnig pedestal 45 isconnected in parallel with the secondary switch 87 so that at any timethis pedestal i used, it will start the pump which is being controlledby the secondary switch S7 regardless of whether the pump controlled byswitch S5 is operating or not.

Thus, if no pump is running and switch 93 is set to connect switch 35with motor Q5 and switch S7 with motor 1.01, closure of switch (:3 willstart motor 101. If any of the other switches 29 to 43 is subsequentlyclosed, it will immediately bring in motor 99. If switch 2'37 issubsequently closed it will be ineffective since motor 101 is alreadyoperating, unles pedestal 45 is shut down, in which case switch 87 willhold motor 101 energized.

Thus, a good supply of liquid is assured when the highspeed pedestal anda regular pedestal are being used simultaneously or when more than apredetermined number of regular pedestals are in use. The action ispositive in that the energization of the pumps is totally independent ofthe conditions which effect the flow of fluid in the lines. Thus, thesystem is not subject to hunting which is a defect of pressure or flowresponsive controls. Neither need it be adjusted to the particular flow,pressure, friction, etc. conditions of the system in which it operatesas do systems which are responsive to pressure or flow conditions.

Further, the entire solenoid and switch system, except the pedestalswitches can be mounted in the station building at a point remote fromall of the gasoline handling means so that it need not be of vapor proofconstruction. This greatly reduces the cost or" such installations.

Modified form Referring to Figures 8, 9 and 10, a modified form ofcontrol mechanism is shown which is hydraulic.

The solenoids 6%, 71', 73', 75', 77, '79, 81' and 83' are connected inthe system in the same manner as the solenoids 59 to 83 described above.Each armature 2G1 is connected to the end or" a lever 203 which has itsother end pivotally mounted at 205 on a back plate 297, as shown inFigure 10. Each lever carries a screw 2139 which is held in place by anut 211 and which presses on the end of a bellows 213 which is suitablysupported by the yolzes 2E5, 23.7 and guide block 219 secured to theback plate.

Each bellows, and there is one for each solenoid, is connected by a tube221 in communication with a manifold 223 which is supported on the plate207 by clips 225.

A master bellows 227 is connected in communication with the manifold bya tube 229 at one end and with a reservoir 231 at the other end.

A bracket 233 mounted on the plate supports the reservoir. A cap 235,which is vented at 237, covers the reservoir and slidably guides theneedle valve 239 which controls the orifice 241 of the tube 243 whichconnects the bellows 227 and the reservoir.

A plunger rod 245 is guided in a bearing 247 also fastened to the plate2%? and has a spring seat 249 fixed to its lower end to retain thespring 251 which rests upon a flange 253 formed on the reservoir.

The plunger rod is provided with a bore lower end into which the upperend of the press fitted and a flange 257 on the valve end of the rod.

A spring 259 is confined between the bearing 247 and the seat 249. Thisspring is more rigid than spring 251 so that the latter will yield whenbellows 227 expands.

Stop nuts 261 are threaded on the upper end of the rod and engage thebearing 247 to limit downward travel 6 of the rod and a switch actuatorcollar 263 is adjustably fixed to the upper end of the rod.

As shown in Figure 8, an arm 265 is fixed to the flange 253 and isadapted to bear down on the actuating lever of a self closing primaryswitch to hold the switch open.

Similarly, an actuator 269 of a secondary switch 87 which is positionedfor operation by the collar 263 and which is normally open and is closedby the collar. Numeral 93' indicates the reversing switch.

Bracket supports a depending tube 234 which partially encloses thebellows 227 to guide it and prevent it from being damaged.

Operation The primary switch 35, secondary switch S7 and re versingswitch 36 are connected in the circuit shown in Figure 4 in the samemanner as the switches 85, 87 and 93 described above.

Attention is first directed to the fact that spring 259 holds theplunger 245 in its downward position which is determined by the contactof the stop nuts 261 with bracket 247. The spring 251 urges thereservoir 231 and bellows 227 downwardly so that the reservoir will reston the bracket 233. When the rod and reservoir are thus located, thevalve 239 is off the seat 241, preferably about .005 inch, so that fluidcan flow between the reservoir and the bellows.

Thus any gas entrapped in the system can escape and liquid can move intoor outof the system as the temper ature varies.

However, as soon as any pedestal switch is closed, a solenoid 69" to 3-3is energized and its corresponding bellows 213 is compressed. The liquidexpelled from the bellows is transmitted through the manifold to thebellows 227 to elongate it and to raise the reservoir 231 until the seat241 contacts valve 239. The spring 251 is compressed suiliciently topermit this action.

The liquid system is now sealed and further motion lifts the rod 245.The operation of a second pedestal switch results in a further extensionof the bellows 227 and so on.

The first movement of the bellows 227 raises the arm 265 from theactuator of switch 85 so that it will close and start the first pump.Usually the switch 87 is so set that the third expansion of the bellows227 will cause the collar 263 to move the switch actuator 26? far enoughto close switch 87 so that the second pump is started.

The switches 85', 87' are opened in the reverse order as pedestalswitches are opened.

It will be seen that this structure will have the same advantages andwill perform the same functions as the preferred form.

It is obvious that various changes may be made in the form, structureand arrangement of parts without de parting from the spirit of theinvention. Accordingly, applicants do not desire to be limited to thespecific embodiment disclosed herein primarily for purposes ofillustration; but instead, they desire protection falling fairly withinthe scope of the appended claims.

What we claim to be new and desire to Letters Patent of the UnitedStates is:

1. In a control system, the combination of a primary switch, a secondaryswitch, a number of selectively operable control switches, a number ofcontrol device actuated means each connected for energization by acontrol switch, means responsive to the energization of any controldevice actuated means for closing said primary switch and meansresponsive to the subsequent energization of a predetermined additionalnumber of said control device actuated means for closing said secondaryswitch.

2. In a control system, the combination of a primary switch, a secondaryswitch, a number of selectively operable control switches, a number ofcontrol device actuated means each connected for operation by a controlswitch,

protect by means responsive to the energization of any control deviceactuated means for closing said primary switch, means responsive to thesubsequent energization of a predetermined additional number of saidcontrol device actuated means for closing said secondary switch, aprimary motor, a secondary motor, and a reversing switch connectedbetween said primary and secondary switches and said motors forselectively connecting said motors for operation by said primary andsecondary switches.

, 3. In a control system, the combination of a primary control means, asecondary control means, a number of selectively operable controldevices, a number of control device actuated means each connected foroperation by a control device, means responsive to the operation of anycontrol device actuated means for actuating said primary .control means,means responsive to the subsequent operation of a predeterminedadditional number of said control device actuated means for actuatingsaid secondary control means, a prime mover connected to be controlledby said primary control means, 'an additional prime mover connected tobe controlled by said secondary control means, another selectivelyoperable control device and means for connecting it directly to controlsaid additional 'prime mover.

4. In a control system, the combination of a primary control means, asecondary control means, a number of selectively operable controldevices, a number of control device actuated means each connected foroperation by a control device, means responsive to the operation of anycontrol device actuated means for actuating said primary control means,means responsive to the subsequent operation of a predeterminedadditional number of said control device actuated means for actuatingsaid secondary control means, a primary motor, a secondary motor, and areversing mechanism connected to selectively place said primary andsecondary motors under the control of said primary or secondary controlmeans.

5. In a control system, the combination of a primary switch, a secondaryswitch, a number of selectively operable control switches, a number ofsolenoids each connected for operation by a control switch, meansresponsive to the energization of any solenoid for closing said primaryswitch, means responsive to the subsequent energization of apredetermined additional number of said solenoids for closing saidsecondary switch, a primary motor, a secondary motor, and meansconnecting said primary and secondary motors to said primary andsecondary switches respectively.

6. In a control system, the combination of 'a primary switch, asecondary switch, ,a number of selectively operable control switches, anumber of solenoids each connected for operation by a control switch,means responsive to the energization of any solenoid for closing saidprimary switch, means responsive to the subsequent energization of apredetermined additional number of said solenoids for closing saidsecondary switch, a primary motor, a secondary motor, and meansconnecting said primary and secondary motors to said primary andsecondary switches respectively, and a reversing switch connectedbetween said primary and secondary motors and primary and secondaryswitches for selectively reversing said connecting means.

7. In a control system, the combination of a primary switch, a secondaryswitch, a series of selectively operable control switches, controldevice actuated means connected for energization by each of said controlswitches, switch actuating means operable by any said control deviceactuated means for movement progressively through a series of stations,means operable by saidswitch actuating means when it reaches one stationfor actuating said primary switch and when it reaches a second stationfor actuating said secondary switch. 7

8. In a control system, the combination of a switch, anumber ofselectively operable control switches, a number of solenoids each havinga movable armature and c: each connected for operation by a controlswitch, a flexible member operatively connected to the armatures so thatmovement of each armature will create a longitudinal movement of saidmember, means for connecting said member to actuate said switch, andmeans for relatively adjusting the switch and connecting means to varythe amount of movement of said flexible member required to close theswitch.

9. In a control system, the combination of a primary switch, a secondaryswitch, a number of selectively operable control switches, a number ofsolenoids each having a movable armature and each connected foroperation by a control switch, a bail adapted to be actuated by theenergization of any solenoid for closing said primary switch, a flexiblemember operatively connected to the armatures so that movement of eacharmature will create a longitudinal movement of said member, and meansfor connecting said member to actuate said secondary switch.

10. In a control system, the combination of a primary switch, asecondary switch, a number of selectively operable control switches, anumber of solenoids each hav- 'ing a movable armature and each connectedfor operation by a control switch, means including a bail adapted foractuation by any of the solenoids for closing said primary switch, aflexible member operatively connected to the armatures so that movementof each armature will create a longitudinal movement of said member,means for connecting said member to actuate said secondary switch, aprimary motor, a secondary motor and means for connecting each ofsaid'motors to one of said primary or secondary switches.

11. In a control system, the combination of a normally open switch, adisplaceable actuating means therefor, a number of selectively operablecontrol switches, a

number of control device actuated means each connected for operation bya control switch and including a member displaceable a predetermineddistance upon operation of the control device actuated means and meansconnecting said members to displace said actuating means in proportionto the sum of the displacement of the displaced members.

12. In a control system, the combination of a normally open switch, adisplaceable actuating means therefor, a number of selectively operablecontrol switches, a number of control device actuated means eachconnected for operation by a control switch and including a memberdisplaceable a predetermined distance upon operation of the controldevice actuated means, means connecting said members to displace saidactuating means in proportion to the sum of the displacement of thedisplaced members, said actuating means being effective to close saidswitch when said displacement of said actuating means is the equivalentof a predetermined multiple of the displacement efiected by one member.

13. In a control system, the combination of a switch movable from opento closed position, a number of fulcrums, a member mounted for movementto close and open said switch, a tape connected to said member at oneend, extending past and in contact with said fulcrums and fixed at itsother end, a series of solenoids having movable armatures, tapeactuating means supported by each armature and disposed in contact withthe tape on the side opposite the fulcrums when the solenoid isdeenergized, said tape actuating means being interposed between adjacentfulcrums, a series of control switches, one for each solenoid, so thatupon energization of the solenoids, the tape actuating means willintroduce a bight in the tape, and means connecting each switch toenergize or deenergize its solenoid.

14. In a control system, the combination of a switch movable from opento closed position, a number of fulcrums, a member mounted for movementto close and open said switch, a tape connected to said member at oneend, extending past and in contact with said fulcrums and fixed at itsother end, a series of solenoids having movable armatures, tapeactuating means supported by each armature and disposed in contact withthe tape on the side opposite the fulcrums when the solenoid isdeenergized, said tape actuating means being interposed betweenadjacentfulcrums so that upon energization of the solenoids, the tape actuatingmeans will introduce a bight in the tape, a series of control switches,one for each solenoid, and means connecting each switch to energize ordeenergize its solenoid, means on said member for adjusting the positionof the switch relative to said member to alter the amount of movement ofthe tape required to close the switch.

15. In a control system, the combination of a switch movable from opento closed position, a number of fulcrums, a member mounted for movementto close and open said switch, a tape connected to said member at oneend, extending past and in contact with said fnlcrums and fixed at itsother end, a series of solenoids having movable armatures, tapeactuating means supported by each armature and disposed in contact withthe tape on the side opposite the fulcrums when the solenoid isdeenergized, said tape actuating means being interposed between adjacentfulcrums so that upon energization of the solenoids, the tape actuatingmeans will introduce a bight in the tape, a series of control switches,one for each solenoid, and means connecting each switch to energize ordeenergize its solenoid, a member mounted for movement relative to allof said armatures and disposed for movement by any of them and anormally open switch connected to be closed by said member upon movementthereof by an armature.

16. In a control system, the combination of a normally open switch, adisplaceable actuating means therefor, a number of selectively operablecontrol switches, a number of control device actuated means eachconnected for operation by a control switch and including an hydraulicmember displaceable a predetermined distance upon operation of thecontrol device actuated means, and hydraulic means connected with saidhydraulic members to displace said actuating means in proportion to thesum of the displacement of said members.

17. In a control system, the combination of a normally open switch, anhydraulic motor including displaceable switch actuating means connectedthereto, a number of selectively operable control switches, a number ofcontrol device actuated means each connected for operation by a controlswitch and including an hydraulic bellows displaceable a predetermineddistance upon operation of the control device actuated means, meansconnecting said bellows to displace said hydraulic motor and saidactuating means in proportion to the sum of the displacement of saiddisplaced bellows, said actuating means being effective to close saidswitch when said displacement is the equivalent of a predeterminedmultiple of the displacement effected by one bellows.

18. In a control system, the combination of a normally open switch, anhydraulic motor including displaceable switch actuating means connectedthereto, a number of selectively operable control switches, a number ofcontrol device actuated means each connected for operation by a controlswitch and including an hydraulic bellows displaceable a predetermineddistance upon operation of the control device actuated means, meansconnecting said bellows to displace said hydraulic motor and saidactuating means in proportion to the sum of the displacement of saiddisplaced bellows, said actuating means being effective to close saidswitch when its displacement is the equivalent of a predeterminedmultiple of the displacement eflected by one bellows, a reservoirmounted on the upper end of said hydraulic motor and communieatingtherewith through a port having a valve seat, a valve connected withsaid switch actuating means and movable therewith relative to said seat,first yieldable means holding said valve away from said seat, secondyieldable means for urging said valve toward said seat, stop means forlimiting the movement of said valve toward the seat, said firstyieldable means being weaker than the second so that the initialmovement of said reservoir will move the seat into contact with thevalve to seal the hydraulic means.

References Cited in the file of this patent UNITED STATES PATENTS578,673 Boetcher Mar. 9, 1897 668,978 Carlson Feb. 26, 1901 1,540,741Hunter June 2, 1925 1,672,690 Runner June 5, 1928 2,042,169 Cook May 26,1936 2,129,526 Crago Sept. 6, 1938 2,482,496 McGilliuray Sept. 20, 1949

